Ok, so I got this fairly new 1911 Mark 4, and it fired inconsistently... meaning sometimes it would fire, sometimes just a "click" - with nothing. At first, I thought it was a bad mag, no gas, etc. But after further inspection, I found that my Impact Hammer #35 could flop up and down in the Impact Frame #34. I read several postings about this, but nothing definitive. This seems to be an issue for several KWA owners. I stripped my gun down thinking it might be the alignment of the Sear Spring, or the Impact Hammer Lock.

After many headaches (what is up with that silly little Impact Pin #60?!) I realized that my problem was the Impact Hammer #35 itself. There is a pin on the thing that is not apparent in the schematic/parts diagram.

Rather than first buy a new Impact Hammer and go through the hassle of tearing the trigger assembly apart, I'm gonna try to drill a hole in the Impact Hammer and put in a tiny piece of steel bar in there to see if I can short cut the fix with a stronger repair. I'll let you know how it goes.

Had I known this was the issue with the gun, I probably could have saved myself about 3-4 hours. I hope my discovery here and explanation will help you avoid the wasted time.

Update - I had to pull the inner frame out of the main frame in order to pull the impact hammer out of the impact frame. You can follow the photos here to see how I went about creating a new impact hammer nub.

Now that everything is working, this gun rocks. I'll be interested to see if I stressed the Impact Hammer by drilling on it. The metal seemed to be good quality (not like that crummy pot metal we see in some of the other manufactures' guns.

I have got to the step where you drilled a hole and inserted the metal rod, what im having troubles with is how to position the impact spring in order to push against the rod. Any help would be appreciated.

You've got to wind or pry the spring a little to apply pressure to the nub. It is a real bugger and if you have any really small mechanics with tiny fingers... use them. The impact Hammer should be forced to push down. It only needs to flex when you are pushing a magazine up into the well. Good luck!

This is an excellent guide to fix this issue. But it requires a little technical know how to do, which I unfortunatley do not have. I have been on the search for part #35 for well over 8 months now since that little nub broke on me. And I have never been able to find one.

With the 2013 season right around the corner, does anyone know where one of these is available? The store here never seems to carry one.

Guys, sorry to make a "topic rescue" but it's necessary.
I fixed my gun with a dentistry drill bit (diamond made) and a lot of patience (always use a lower drill rpm i.e. 3000~4000rpm).

After reassembling the gun, my mags couldn't be released with the gun close and "decocked", or else, being on "normal position.
My mags just could be released with the gun cocked, the reason is that i left a large pin outside of the hole, into the sides of Part #35.

The bad thing is to cock the gun to release the mag, the good news is that i found WHY this part #35 is broken.

IT´S NOT dry fire as KWA says, its the magazine that slips out the little nub used to hold the spring into the place!

My gun was never fired dry BUT i used it into a IPSC-A section and guess what?
The fast magazine changes during IPSC broke part #35!

So, my tip to you guys is ask KWA, WHY this bad projected part (the little nub) is messing our guns!
The impact hammer could be done with a curved spring, passing over the impact hammer, working properly and without more "nub issues".

Finally, for 1911 PTP owners, that have a original gun, without any issues.
The tip is as follows:
Just sand the Magazine a little bit and the magazine will never more snap the little nub at impact hammer.

Finally, for 1911 PTP owners, that have a original gun, without any issues.
The tip is as follows:
Just sand the Magazine a little bit and the magazine will never more snap the little nub at impact hammer.

KWA was advised by me of this engineering issue..

Regards,
Lebrão

With the original #35 Impact Hammer
As you can see, the little nub is closer to the mag, even a sanded magazine.